The deaths of several New Mexico children in recent years—a 13-year-old whose father was accused of fatally torturing him; an eight-year-old who was kicked to death by her mother; a girl raped, strangled and stabbed by her mother’s boyfriend the night before her 10th birthday—drew horror, outrage and scrutiny of the state’s child welfare system. Those incidents drove child welfare and public health specialists Katherine Ortega Courtney and Dominic Cappello to examine the data. Cappello and...